blackjack counting cards how to

By counting cards at blackjack using the method of hi-or low as to have the entire bridge will be?
Always leave at 0 not?
Any method of counting (there are many … Revere, Uston, Red 7, etc) that at the end of a bridge, always zero, provided the number of cards that give a value of -1 is equal the number of cards that give a value of 1.
21 the Movie: How to Card-Count in Blackjack